Radiocoil



Sen/11, ,19281,

/ H. D. CURIER 1,683,606

RADI ocQIL Filed Sept. 8, 1925 Patented Sept. 11,1928.

UNITED STATES4 messes vPArENr;ferriee.

HIRAM D. culmina, or cnIcAso,` 1LL1VNoIs, AssIeNoR ToKEnLosefswizTcHBoAnn ANnsUPrLY COMPANY, or cHreAso, ILLINOIS, ACORPORATION or rnniivors.,v

i nAnIocoI'L.

Y Application filed September 8, 1923. Serial No. 661,551. Y i

invention relates to wireless telephony,V l and has to do moreparticularly with the circuits and systems. y i Y In radio transmittingsets, asV is 'well known, a very high frequency current is usedapparatusfor use in such 'for transmitting the radio signals, `and-thereceiving set must be constructed, if it is to work efficiently, tofunction on these eX- tremely highoscillations Without much loss ofstrength of the incoming signal. When ,such high frequency current isused,' it has been found that alarge loss occurs due to the leakage anddrainage of the coils and apparatus used. It' is one vof the lobjects y.of my inventionto build a coil which is constructed sojas to prevent agreat deal of the coil. t

The `above features, Vas well as others,

vrelatingto the details of construction, combination of parts, andarrangements, will be hereinafter more particularly pointed out in theensuing specification and appended claims.` 1 Y 'Y For a more completeunderstanding of myl invention, reference may be had to the accompanyingdrawingin whichlike characters, in the different views, denote likeparts, and in which;v

Fig. 1 is a rear elevation of my combined antenna and feed back "coil orcoupler;`

Fig2 isa sideelevation of the same;. y f Referring now more particularlyto F igures 1 and 2 it will befnoted that my tuning coil or coupler issupportedv only at its two ends and that there are only four points ofcontact between the coil and the frame which holds the same. By thismethody of construction and mounting it will readily be noted that Ihave eliminated a great percentage of the contact between the priorcoils and their `mounting frames or tubes thereby greatly decreasingthel amount of Aleakage found in priorcoils when used to receiveextremely high frequency oscillations. .Coil lis composed of suitableinsulated wire wound upon a form and cemented together by any of thewell known substances used for this purpose'. lThe coil is theny rcmovedfrom the cylindrical formhuponl which itrwas Wound and constitutes aself supporting unit.

The mounting frame .for supporting'the coil consists of-a plate 2 ofinsulating inaterial to which are attached rearwardly eX- tending armsBand 4: of insulating material. The arms 3 and 4 are attachedto the plate2 by means of screws 5.. Attached to and at right angles to arms 3 and iare insulating strips 6 and 7, the strips 6 and"7pbeing attached to thearms 8 and L1 by screws 8 and 9'. The ends of the armsv 6 and 7 arerounded off to fit the contour of the coil,

and are provided with shoulder portions that abut against theends of thecoil while the rounded off' portions of the arms fit within the coil fora short dist-ance.Y Thecoil may then beV cemented to these Vsupportingarms.

Attached tothe supporting plate 2 by any suitablefmeans is aftrackmember 10 which` is adapted to receive a rack *member 11 which slidesin; the` groove 12 of' the track y 10.V Attached' to ,the rack 11 is awiper 13 which is adapted toslide over the convolutions or turns `ofthecoil 1, the insulation oftheturns having beenscraped oit' where the`wiper 13 makes contact with thecoil 1.

spring 14 is riveted to the wiper 13 by means of a rivet 15-andrhas itsfree end in contact with the` track 10 to insure perfect contact betweenthe wiper 13 and the track 10. A' spindle 16 extendsthrough an orifice17iu the plate v2, and attachedto the rear ofthe` spindle 16 is a gear 18which `meshes with the teeth. of thera'ck 11. Gear 18may-be secured tothe spindlel Qrshaft 16` by means ofl a,

screw 19.v To the front ofthe shaftlt is attached a dial orcontrollingmember, which is not Vshown inFigures 1 and2. f To mountthe device asaunit, on a panel 20, mounting studs 21 and 22 are provided, and forsecuring the unit in place screws 23 and 24 are provided. A connectionterminal 25 is prom vided which is connected to the wiper 1? through therack 11 and track 10. Other connection terminals26 and 27 are providedwhich are attached to the arm' 7 and other terminals 28 and 29 areprovided and at tached to the arm 6.

From this description it will readily be seen that by turning the dialattached to the shaft 15 the 'wiper 18 moves across the een lit'volutions or turns of the coil 1, and` makes electrical engagement Withthe turns of the coil as it moves from one end thereof to the other, andthat the coil itself is supported by tivo arms which are vonly yinContact with the endconvolutions of the coil.

From the foregoing it will be noted that my tuningcoilris of very simpleconstruction, being a continuous coil supported at only four points, andthat the slidable Wiper 13 makes contact with each convolution of thecoil thereby permitting an accurate tuningof the-'antenna inductance. A

vWhile I have described a particular fornr of coil and arrangement, itis to be understood4 that changes and modilications will readily'suggestthemselves to those skilled in the art, and I, therefore, do not WishtoY beV limited to the enact structure, as shown,

but aim to cover all such changes and modifications as come Within thespirit and scope of the appended claims.

' Having described my invention what I claim as new and desire to secureby United States Letters Patent is:

1;-A tuning device of the character described including convolut-ions ofWire cemented together to form a self-supporting coil, a supportingplate for said coil, arms attached to; said'plate and extendingrearwardly therefrom, and coil supporting members. attached to the freeends of said arms extending atright angles to the .axis of said coil,said coil supporting meinbershaving their `free endsformed to conformtothe in'- ner peripheral surface of said coil and adapted to engage asmall portion of only a few of the convolutions of the coil.

2. Aztuning device of the character described including convoliitions ofWire cemented together to form a self-supporting coil, a supportingplate for said coil, arms attached Ato said plate and extendingrearwardly therefrom, coil Vsupporting Ymembers attached to the freeendsof said arms eX- tending at right anglesv to the axis of said coil. saidcoil` supporting members lhaving their freeA ends formed to conform tothe inner peripheral surface of'said coil and adapted'to engage a smallportion of only a feiv of the convolutions of the coil, a raclr inemberslidably supported by said plate, and a contact Wiper connected to thesaid rack Wardly therefrom, coil supporting members attached to the freeends of 'said armsV extending at right angles to the axis of said coil,said coil supporting members having their free ends formed to conform tothe in-v ner peripheral surface of said 'c oil and adaptedto engageasmall portion of the inner peripheral surface of the coil, a rack'memberslidably supported by lsaid plate, a Contact Wiper connected rto thesaid'rack `member having av contact portion adapted to be moved back andforth across the convolu-y tions of said coil to make electrical engagenment therewith, and a member rotatably supported by said plate andadapted to engage said rack to move'said-iviper back and forth.

4i. yA timing device of the character described including c onvolutionsof Wire cemented together to form a. self-supporting coil, a supportingplate for said coil, arms attached to said plate and extendingrearwardiytherefrom, coilr supporting members at"-l tached to the freeends of said arms extending at right angles to the aXis of said coil,said coil supporting membersv having their free ends formed toconformrto the inner peripheral surface of said coil and adapted toengage only a small portion thereof, terminals held by said. coilsupporting members,

and connected to said,` coil, a grooved vinember attached to Y`saidplate, a rack member vadaptedto fit* into the'groove in said memf' ber,a contact Wiper connected to said rack member and provided ivitha'spring member adapted to contact with said grooved vIncinber, and meansfor moving Asaid rack member-in a longitudinal direction to cause thecontact Wiper to electrically engage the con-v volutions Vof said coil.

Signed by me at Chicago, inthe county of Cook and State of Illinois,thisllday of Sept., 1923.

Hman D. `ciniiiiiiii..

